CLEAR 
SET NULL ON
CREATE CURSOR BYBYBUG (AB M NOT NULL)
X1="''"
? EVALUATE([&X1])==&X1  && are fully equal
INDEX ON CAST(&X1 AS C(200))	TAG T2                  && no error
INDEX ON CAST(&X1 AS V(200))	TAG T2V                 && no error
INDEX ON CAST(EVALUATE([&X1]) AS C(200))	TAG T3  && no error
INDEX ON CAST(EVALUATE([&X1]) AS V(200))	TAG T3V	&& FIRE A ERROR, DON'T SHOULD